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efficiency

Pronunciation: /ɪˈfɪʃ(ə)nsi/

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Definition of efficiency

noun (plural efficiencies)

[mass noun]
  • the state or quality of being efficient:greater energy efficiency
  • [count noun] an action designed to achieve efficiency:the reforms will lead to efficiencies and savings
  • [count noun] technical the ratio of the useful work performed by a machine or in a process to the total energy expended or heat taken in: the boiler has an efficiency of 45 per cent

Origin:

late 16th century (in the sense 'the fact of being an efficient cause'): from Latin efficientia, from efficere 'accomplish' (see effect)

efficiency in other Oxford dictionaries

Definition of efficiency in the US English dictionary

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